Physics – High Energy Physics
Scientific paper
Apr 2005
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005iche.conf..892d&link_type=abstract
HIGH ENERGY PHYSICS, ICHEP 2004. Proceedings of the 32nd International Conference. Held 16-22 August 2004 in Beijing, China. Edi
Physics
High Energy Physics
Scientific paper
We report studies of B → Xuℓν decays, based on a sample of 88 million Bbar {B} events recorded with the BABAR detector. From both tagged and untagged Bbar {B} events we have isolated inclusive charmless decays in kinematic regions for which the dominant background from B → Xcℓν is reduced by making requirements on different variables: the electron energy El, the momentum transfer q2, and the hadronic mass mX. Using theoretical calculations we extrapolate to the total decay rate to determine the CKM matrix element |Vub|. In addition, we have measured the branching fraction for exclusive semileptonic decays, such as B → π(ρ, ω, η, a0)ℓν. A high signal purity is achieved by selecting events in which a decay of the second B meson is either fully or partially reconstructed.
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